Spanning Tree - 3Com 3C16476CS User Manual

Figure 33 Tagged VLAN Configuration
To set up the configuration shown in
the following:
Create VLAN2 on both Switch 1 and Switch 2. You
1
need not create VLAN1 since it exists by default.
On Switch 1, set the ports that you want to be part of
2
VLAN2 to Untagged. Set one port (for example, port
16) to Tagged.
Click Apply.
On Switch 2, set the ports that you want to be part of
3
VLAN2 to Untagged. Set one port (for example, port
8) to Tagged.
Click Apply.

Spanning Tree

Figure 33, do
Connect the Tagged port on Switch 1 (in this
4
example, port 16) to the Tagged port on Switch 2 (in
this example, port 8).
Those ports on Switch 1 that are members of VLAN2
can now communicate with those ports on Switch 2
that are members of VLAN2.
Spanning tree is a bridge-based system for providing
fault tolerance on networks and can be used to
detect and disable network loops. The spanning tree
ensures that the optimal path is maintained between
spanning tree-compliant networked devices by:
Disabling redundant paths when the main paths
■
are operational.
Enabling redundant paths if the main paths fail.
■
Spanning tree uses a distributed algorithm to select a
bridging device that serves as the root of the
spanning tree network. The bridging device, known
as the Root Bridge, generates bridge protocol data
units (BPDUs) on all ports at a regular interval known
as the Hello Time. All other spanning tree-compliant
devices on the network have a designated Root Port.
This is the Port nearest the Root Bridge and it is used
for receiving the BPDUs initiated by the Root Bridge. If
a bridge does not get a Hello BPDU after a
predetermined interval, the bridge assumes that the
link to the Root Bridge is down. This bridge will then
initiate negotiations with other bridges to reconfigure
the network to reestablish a valid network topology.
Configuring VLANs 41